166251193 has 2 divisors, whose sum is σ = 166251194. Its totient is φ = 166251192.

The previous prime is 166251191. The next prime is 166251223. The reversal of 166251193 is 391152661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161874729 + 4376464 = 12723^2 + 2092^2 .

It is an emirp because it is prime and its reverse (391152661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166251193 - 2¹ = 166251191 is a prime.

Together with 166251191, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166251191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83125596 + 83125597.

It is an arithmetic number, because the mean of its divisors is an integer number (83125597).

Almost surely, 2^166251193 is an apocalyptic number.

It is an amenable number.

166251193 is a deficient number, since it is larger than the sum of its proper divisors (1).

166251193 is an equidigital number, since it uses as much as digits as its factorization.

166251193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 166251193 is about 12893.8432207003. The cubic root of 166251193 is about 549.8635396994.

The spelling of 166251193 in words is "one hundred sixty-six million, two hundred fifty-one thousand, one hundred ninety-three".